remove holes (#492)

* remove holes

* don't import class that doesn't exist

* remove subs in template code

* remove subs_created

* fix sticky bug

* uh... i think this will fix it????

* fix stupid nearly ungrokkable nesting error

* ...

* ....

* ....

* *sigh*

* .............................i think i got it.

* Revert ".............................i think i got it."

This reverts commit 419a545875.

* Revert "*sigh*"

This reverts commit fcfc9d7995.

* Revert "...."

This reverts commit e200c8f6f0.

* Revert "...."

This reverts commit 681db8cb02.

* Revert "..."

This reverts commit c54372b9ff.

* Revert "fix stupid nearly ungrokkable nesting error"

This reverts commit e202fd774c.

* Revert "uh... i think this will fix it????"

This reverts commit e4d9366093.

* readd missing endif

* fix email templates.

* fix frontpage listing

* some minor fixes wrt saving

* fix some listing errors

* Remove more references to holes system

A couple of these came from the merge of #554. A few others were just
left in the templates and presumably hard to catch on the first
removal pass.

* remove unnecessary lazy

* Add migration

Tested. Very sensitive to order. I wound up borrowing the statement
order we used for deleting sub rows on upstream (manually, of course).

---------

Co-authored-by: TLSM <duolsm@outlook.com>

files/commands/seed_db.py

@@ -103,7 +103,6 @@ def seed_db_worker(num_users = 900, num_posts = 40, num_toplevel_comments = 1000
 			embed_url=None,
 			title=f'Clever unique post title number {i}',
 			title_html=f'Clever unique post title number {i}',
-			sub=None,
 			ghost=False,
 			filter_state='normal'
 		)